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• W2030483746 abstract "Changes in the nitrogen functionality of 15N-enriched condensation products prepared from glucose and 15N-glycine were investigated during pyrolysis at 600–1000 °C. The structural changes in the condensation products were studied by means of solid-state 13C and 15N NMR spectroscopies. During pyrolysis, the aliphatic moieties of the condensation products decomposed and evolved as gas and tar. At pyrolysis temperatures above 600 °C, almost all the carbon in the chars were converted to aromatic carbon. After pyrolysis, large amounts of nitrogen remained in the chars as char nitrogen (char-N), and about 30% of the nitrogen was eliminated from the chars as HCN and NH3. With increasing temperature, the production of HCN and NH3 increased and the amount of char-N decreased. By combining X-ray photoelectron spectroscopy and NMR results, detailed results for nitrogen fractions in chars were obtained. During pyrolysis, the fraction of unsubstituted pyrrole-N decreased and the fraction of quaternary-N increased. The fraction of pyridine-N remained almost constant at temperatures below 800 °C, but at 900 °C and above, the fraction of pyridine-N decreased. The fraction of substituted pyrrole-N showed minimum at 800 °C. On the basis of these results, structural changes of nitrogen functional groups during pyrolysis are discussed." @default.
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• W2030483746 date "2002-12-01" @default.
• W2030483746 modified "2023-10-18" @default.
• W2030483746 title "Change of nitrogen functionality of 15N-enriched condensation products during pyrolysis" @default.
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• W2030483746 doi "https://doi.org/10.1016/s0016-2361(02)00171-0" @default.
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